I beleive AIR got rid of their freighter , {a DC 8 series 50}which was the wrong aircraft 20 years ago.
Emirets out of Auckland and Chtristchurch carry up to 40 to 50 tons a day.This capacity can be booked up months in advance.
Qantas and Singapore carry 100 ton out of each ChCh/Auck a day.Because AIR are full of passengers their capacity is only 2 tons per plane.ChCh with fish/meat is stretched.